Answer :
Final answer:
The first action of a second rescuer arriving at a CPR scene should be to check the victim's pulse. This step is crucial for understanding the current condition of the victim and the effectiveness of the on-going resuscitation. Hence the correct option is (a).
Explanation:
When a second rescuer of equal certification arrives at the scene of CPR already in progress, the first thing they should do is to check the victim's pulse. This is crucial, as it lets the second rescuer know about the effectiveness of the ongoing CPR and the current condition of the victim.
This guideline is according to the American Heart Association, which puts emphasis on the need for a pulse check when a second rescuer arrives at a scene where CPR is being performed. If the start of chest compressions, rescue breaths or assessment of victim's airway were given first priority, it could complicate the resuscitation process by interrupting the on-going CPR without first understanding the patient's condition.
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